RooLowLinTail Class Reference

Linear tail below the photopeak, convolved with the resolution. More...

#include <RooFitPhotopeakPdfs.hpp>

Inheritance diagram for RooLowLinTail:

Collaboration diagram for RooLowLinTail:

Public Member Functions
	RooLowLinTail ()
	Default constructor for ROOT I/O; leaves proxies unbound.
	RooLowLinTail (const char *name, const char *title, RooAbsReal &x, RooAbsReal &mu, RooAbsReal &sigma, RooAbsReal &slope)
	Construct the component and bind its parameters.
	RooLowLinTail (const RooLowLinTail &other, const char *name=nullptr)
	Copy constructor used by RooFit when cloning a model.
TObject *	clone (const char *newname=nullptr) const override
	RooFit clone hook.
Int_t	getAnalyticalIntegral (RooArgSet &allVars, RooArgSet &analVars, const char *rangeName=nullptr) const override
	Advertise the analytic integral over the observable.
Double_t	analyticalIntegral (Int_t code, const char *rangeName=nullptr) const override
	Evaluate the analytic integral advertised above.
void	doEval (RooFit::EvalContext &ctx) const override
	Batched evaluation over every event in one pass.
bool	canComputeBatchWithCuda () const override
	Whether doEval() can consume device-resident buffers.

Protected Member Functions
Double_t	evaluate () const override
	Scalar evaluation for a single observable value.

Protected Attributes
RooRealProxy	x_
RooRealProxy	mu_
RooRealProxy	sigma_
RooRealProxy	slope_

Detailed Description

Linear tail below the photopeak, convolved with the resolution.

Captures asymmetric low-side tailing that a single exponential describes poorly. The linear factor (1 + slope * (x - mu)) is floored at zero to keep the density non-negative, as RooFit normalisation requires; the TF1 backend in FittingUtils applies no such constraint, so a fit that hits the floor will not agree between the two backends.

Definition at line 225 of file RooFitPhotopeakPdfs.hpp.

Constructor & Destructor Documentation

RooLowLinTail() [1/3]

RooLowLinTail::RooLowLinTail ( )

inline

Default constructor for ROOT I/O; leaves proxies unbound.

Definition at line 228 of file RooFitPhotopeakPdfs.hpp.

Referenced by clone(), and RooLowLinTail().

RooLowLinTail() [2/3]

RooLowLinTail::RooLowLinTail	(	const char *	name,
		const char *	title,
		RooAbsReal &	x,
		RooAbsReal &	mu,
		RooAbsReal &	sigma,
		RooAbsReal &	slope )

Construct the component and bind its parameters.

Parameters

name	RooFit object name, unique within the workspace.
title	Human-readable title.
x	Observable (energy).
mu	Peak centroid, in the observable's units.
sigma	Gaussian resolution; must be positive.
slope	Slope of the linear factor (1 + slope * (x - mu)), in inverse units of the observable.

Definition at line 289 of file RooFitPhotopeakPdfs.cpp.

RooLowLinTail() [3/3]

RooLowLinTail::RooLowLinTail	(	const RooLowLinTail &	other,
		const char *	name = nullptr )

Copy constructor used by RooFit when cloning a model.

Parameters

other	Instance to copy.
name	New object name, or null to keep other's.

Definition at line 296 of file RooFitPhotopeakPdfs.cpp.

Member Function Documentation

analyticalIntegral()

Double_t RooLowLinTail::analyticalIntegral ( Int_t code, const char * rangeName = nullptr ) const

override

Evaluate the analytic integral advertised above.

Parameters

code	Code returned by getAnalyticalIntegral(); only 1 is supported.
rangeName	Named range, or null for the full range.

Returns

The integral over the requested range.

Definition at line 349 of file RooFitPhotopeakPdfs.cpp.

canComputeBatchWithCuda()

bool RooLowLinTail::canComputeBatchWithCuda ( ) const

inlineoverride

Whether doEval() can consume device-resident buffers.

Returns

true in a CUDA build, false in a CPU build.

Definition at line 286 of file RooFitPhotopeakPdfs.hpp.

clone()

TObject * RooLowLinTail::clone ( const char * newname = nullptr ) const

inlineoverride

RooFit clone hook.

Parameters

newname

Name for the clone, or null to reuse this one's.

Returns

A heap-allocated copy; ownership passes to the caller.

Definition at line 248 of file RooFitPhotopeakPdfs.hpp.

doEval()

void RooLowLinTail::doEval ( RooFit::EvalContext & ctx ) const

override

Batched evaluation over every event in one pass.

Hoists the parameter-dependent constants out of the loop and writes one density per event. Dispatches to a CUDA kernel when built with CUDA support and handed device-resident buffers; otherwise runs an OpenMP host loop.

Parameters

ctx	RooFit evaluation context supplying inputs and the output span.

Definition at line 310 of file RooFitPhotopeakPdfs.cpp.

evaluate()

Double_t RooLowLinTail::evaluate ( ) const

overrideprotected

Scalar evaluation for a single observable value.

Returns

The unnormalised density, floored at 1e-300; zero if the parameters are non-physical.

Definition at line 301 of file RooFitPhotopeakPdfs.cpp.

getAnalyticalIntegral()

Int_t RooLowLinTail::getAnalyticalIntegral ( RooArgSet & allVars, RooArgSet & analVars, const char * rangeName = nullptr ) const

override

Advertise the analytic integral over the observable.

Parameters

allVars	Variables RooFit offers to integrate over.
analVars	Filled with those handled analytically.
rangeName	Named range, or null for the full range.

Returns

1 if the integral over x is available, 0 otherwise.

Definition at line 341 of file RooFitPhotopeakPdfs.cpp.

Member Data Documentation

mu_

RooRealProxy RooLowLinTail::mu_

protected

Definition at line 291 of file RooFitPhotopeakPdfs.hpp.

Referenced by analyticalIntegral(), doEval(), evaluate(), RooLowLinTail(), and RooLowLinTail().

sigma_

RooRealProxy RooLowLinTail::sigma_

protected

Definition at line 292 of file RooFitPhotopeakPdfs.hpp.

Referenced by analyticalIntegral(), doEval(), evaluate(), RooLowLinTail(), and RooLowLinTail().

slope_

RooRealProxy RooLowLinTail::slope_

protected

Definition at line 293 of file RooFitPhotopeakPdfs.hpp.

Referenced by analyticalIntegral(), doEval(), evaluate(), RooLowLinTail(), and RooLowLinTail().

x_

RooRealProxy RooLowLinTail::x_

protected

Definition at line 290 of file RooFitPhotopeakPdfs.hpp.

Referenced by analyticalIntegral(), doEval(), evaluate(), getAnalyticalIntegral(), RooLowLinTail(), and RooLowLinTail().

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The documentation for this class was generated from the following files:

• include/RooFitPhotopeakPdfs.hpp
• src/RooFitPhotopeakPdfs.cpp